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Biol Bull 60: 152-170. (April 1931)
© 1931 Marine Biological Laboratory
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THE PERMEABILITY OF THE ARBACIA EGG TO NONELECTROLYTES

DOROTHY R. STEWART 1

1 From the Department of Physiology, University of Pennsylvania and the Marine Biological Laboratory, Woods Hole, Massachusetts

1. The permeability of the Arbacia egg has been tested by following the volume changes which occur in solutions of nineteen non-electrolytes.

2. The general behavior of this type of cell agrees fairly closely with that of the plant cells studied by Overton and by Bärlund and, to a somewhat lesser extent, with that of the mammalian erythrocyte.

3. No exception has been found to the principle that compounds which are freely lipoid-soluble readily penetrate the Arbacia egg. In the case of substances which are only slightly lipoid-soluble, the size of the molecule appears to be of importance, but unequivocal evidence on this point is difficult to obtain because of the existence of complicating factors of various sorts.

4. Some evidence has been obtained that following fertilization there is an increase in permeability to ethylene glycol.






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Copyright © 1931 by the Marine Biological Laboratory.